a chemical reaction (below) is first order in A and has a rate constant of 1.2*10^-3 min^-1/ If the initial concentration of A is .40 M, how much time must pass in order to reduce the concentration of A to .22 M

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.